CN101828125A - Birdcage coil with improved homogeneity and reduced SAR - Google Patents
Birdcage coil with improved homogeneity and reduced SAR Download PDFInfo
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- CN101828125A CN101828125A CN200880111834A CN200880111834A CN101828125A CN 101828125 A CN101828125 A CN 101828125A CN 200880111834 A CN200880111834 A CN 200880111834A CN 200880111834 A CN200880111834 A CN 200880111834A CN 101828125 A CN101828125 A CN 101828125A
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- crosspiece
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34046—Volume type coils, e.g. bird-cage coils; Quadrature bird-cage coils; Circularly polarised coils
- G01R33/34076—Birdcage coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/32—Excitation or detection systems, e.g. using radio frequency signals
- G01R33/34—Constructional details, e.g. resonators, specially adapted to MR
- G01R33/34007—Manufacture of RF coils, e.g. using printed circuit board technology; additional hardware for providing mechanical support to the RF coil assembly or to part thereof, e.g. a support for moving the coil assembly relative to the remainder of the MR system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/288—Provisions within MR facilities for enhancing safety during MR, e.g. reduction of the specific absorption rate [SAR], detection of ferromagnetic objects in the scanner room
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/20—Arrangements or instruments for measuring magnetic variables involving magnetic resonance
- G01R33/28—Details of apparatus provided for in groups G01R33/44 - G01R33/64
- G01R33/42—Screening
- G01R33/422—Screening of the radio frequency field
Abstract
A birdcage coil (10) for a magnetic resonance imaging device includes a plurality of rungs (12) coupled to a distal edge (15) of each of two endrings (16). The endrings (16) comprise a plurality of ring segments (18) that are separated by sets of capacitors (20, 22, 24). The rungs (12) are coupled to the endrings (16) by connector portions (14), which create a gap between the endrings (16) and the rungs (12). Additionally, the rungs (12) can be positioned over the capacitors (20, 22, 24), and the connector portions (14) can be shaped to offset the position of the rungs (12) relative to the ring segments (16) to which they are coupled to achieve a desire rung position relative to the capacitors (20, 22, 24).
Description
Technical field
The application is applied to the subject imaging system especially, relates in particular to magnetic resonance imaging (MRI).Yet what should figure out is that described technology also can be applicable to other imaging systems, other medical science schemes or other medical technologies.
Background technology
Conventional birdcage coil designs adopts the crosspiece and the end ring of the flat metal strips that is attached to bearing structure.Have been found that wide crosspiece and wideer ring help reaching high-power sensitivity.When end ring was placed to than the more close radio frequency of crosspiece (RF) radome, the homogeneity in RF magnetic field improved and patient's specific absorption rate (SAR) is minimized.For example, referring to " An Elevated EndringBirdcage Coil for Improved Performance at 3 Tesla " (D.Weyers, D.Keren, E.Boskamp, G.McKinnon, K.Kinsey, Proc.Intl.Soc.Mag.Reson.Med.2004 November, the 1548th page); U.S. Patent application US2005/0107684A1, " Elevated EndringBirdcage Antenna For MRI Applications " (D.J.Weyers, D.Keren, K.Kinsey, B.Boskamp).
Yet the limitation of this type of design is that crosspiece width and end ring width only can increase before beginning that image degradation takes place.In other words, when the total length of birdcage coil since other reasons in structure fixedly the time, widen end ring and reduced effective crosspiece length.Therefore, all between the advantage that advantage that wideer end ring brings and longer crosspiece bring, weigh all the time.
The birdcage coil system that the application provides is new, improved and reduce the method for SAR, described system have the advantage of wideer ring and longer crosspiece, and described method has overcome top these and other problems of being mentioned.
Summary of the invention
According to one side, a kind of birdcage coil that is used for the magnetic resonance imaging device comprises two end ring placing around central shaft, and each end ring has inward flange and remote edge.A plurality of crosspieces are connected on the end ring, the length of described crosspiece is greater than the axial distance that is parallel to extension of central axis between the end ring inward flange, and described crosspiece ends at the point near the remote edge of each end ring, and described crosspiece limits the right cylinder of diameter less than the end ring diameter.Described coil also comprises each the terminal connector part that is positioned at each crosspiece, and described connector part is coupled to the remote edge of each end ring accordingly with corresponding each crosspiece.In one embodiment, crosspiece when being connected to ring segment, be placed to capacitor above.
An advantage is to have increased B
1The intensity of field.
Another advantage is to have improved axial homogeneity.
Another advantage is that axial direction has bigger usable range, and is minimized at the SAR of patient body near those positions of the crosspiece of coil and end ring.
After reading and understanding the instructions, those of ordinary skills can understand other advantages of the present invention.
Description of drawings
The present invention can be embodied as different parts or arrangements of components, and is embodied as different steps and step arrangement.Accompanying drawing only is used to illustrate various aspects, is limitation of the present invention and should not be construed as.
Fig. 1 shows exemplary subject imaging equipment, and this equipment can use with various loop constructions described herein;
Fig. 2 shows the part of birdcage coil, and it comprises a plurality of crosspieces of the remote edge that extends parallel to each other and be coupled in each end end ring;
Fig. 3 illustrates another embodiment of birdcage coil, and wherein, crosspiece is narrower than ring segment;
Fig. 4 illustrates the part of birdcage coil, and wherein, crosspiece is offset with respect to ring segment, thereby makes crosspiece be placed on the top of ring-plate capacitor substantially;
Fig. 5 is the illustrating of part of birdcage, and wherein, each connector part has irregular trapezoidal shape, and has parallel crosspiece lateral edges and ring lateral edges, but also has the incongruent opposite edges across distance between crosspiece and the end ring;
Fig. 6 illustrates the part of birdcage coil, and wherein, connector part has and helps to place crosspiece covering the trapezoidal shape of ring-plate capacitor, and the part of the crosspiece section that connector part was attached to;
Fig. 7 illustrates the part of birdcage coil, and wherein, connector part has irregular trapezoidal shape, and it is placed into crosspiece the top of capacitor substantially under the situation of the ring segment that does not have the covering connector part to be attached to substantially;
Fig. 8 illustrates the part of birdcage coil, and wherein, connector part has parallelogram shape, and it is placed into crosspiece the top of capacitor substantially under the situation of the ring segment that does not have the covering connector part to be attached to;
Fig. 9 illustrates the part of birdcage coil, wherein, be positioned at two capacitors that the end ring capacitor of remote edge is connected in series and substitute, and connector part is connected to the inter-engagement place of these two capacitors;
Figure 10 illustrates the part of birdcage coil, wherein, a part or all ring-plate capacitors are had a suitable increase by its value capacitor to substitute, and the inter-engagement place is connected with the bonding jumper of the remote edge that is stretched over ring segment and is connected with connector part.
Embodiment
System and method described herein helps to improve sensitivity and homogeneity in the SAR of the birdcage coil that reduces magnetic resonance imaging (MRI) system, and uses various design features to improve coil performance.According to various aspects, the crosspiece of birdcage coil (rung) is coupled to far-end (for example, with respect to the center of the birdcage coil) edge of end ring, rather than is coupled to the inward flange of end ring as conventional birdcage coil is common.This makes and can produce coil more closely under the situation of maximization or optimization crosspiece length and end ring width.Structure described herein has reduced to double the birdcage length of end ring width thus.In addition, described loop construction can help to reduce " active volume " of coil and reach corresponding higher power sensitivity.
With reference to accompanying drawing 1, illustrate magnetic resonance (MR) scanner 2 that can adopt various coil blocks described herein.Described MR scanner comprises columniform main magnet assembly 4.Main magnet assembly 4 can be the superconducting solenoid (superconducting cryoshielded solenoid) of low temperature shielding, and it limits and places the chamber 6 of person under inspection to carry out imaging therein.Main magnet assembly 4 produces along the chamber the substantially invariable main field of 6 longitudinal axis orientation.Although what illustrate is columniform main magnet assembly 4, should be understood that, also can predict other magnet apparatus, for example perpendicualr field, open magnet, non-superconducting magnet and other shapes.
Whole body radio frequency coil assembly 10 (for example, birdcage coil assembly) produces radio-frequency pulse to be used for exciting magnetic resonance at person under inspection's dipole.Radio frequency coil assemblies 10 also is used for the magnetic resonance signal of detection resources from the imaging zone.In addition, in chamber 6, illustrate optional local coil, to carry out sensitiveer local space coding, to excite with magnetic resonance signal and receive.Can predict various types of coil arrays, for example have an output simple surfaces RF coil, have two outputs the quadrature coil assembly, have some outputs phased array, have a large amount of outputs the SENSE coil, have both RF of input and output and gradient built-up coil, or the like.Birdcage coil 10 and/or local coil 10 ' comprise a plurality of crosspieces 12 of the remote edge of the inside surface that is coupled to 16 pairs of end ring, as what illustrate illustrated in the cut-open view in Fig. 1.Gradient pulse amplifier 30 is sent to magnetic field gradient coils 8 to produce selected magnetic field gradient with controlled electric current.Gradient amplifier also is sent to electric pulse the gradient coil of the local coil array that is equipped with gradient coil.Radiofrequency launcher 32 is applied to radio frequency coil assemblies 10 in the mode of analog or digital with radio-frequency pulse or packet of pulses, to produce selected magnetic resonance excitation.Radio frequency receiver 34 is coupled to local coil 10 ' with the magnetic resonance signal that receives and demodulation is inducted.Randomly, whole-body coil 10 is connected to receiver with wired or wireless interconnection mode.
In order to gather person under inspection's magnetic resonance imaging data, the person under inspection is placed to the inside of magnet bore 6, make the zone of imaging be positioned at or near main field etc. the center.Sequence controller 40 communicates with gradient amplifier 30 and radiofrequency launcher 32, to generate selected instantaneous or steady state magnetic resonance sequence, this type of magnetic resonance of space encoding, selectivity upsets magnetic resonance, perhaps otherwise produces the selected magnetic resonance signal of representing person under inspection's feature.The magnetic resonance signal that is produced is detected by local coil 10 ', communicates with radio frequency receiver 34, and is stored in the k space memories 42.Imaging data is rebuild by reconstruction processor 44, is stored in graphical representation in the video memory 46 with generation.In a suitable embodiment, reconstruction processor 44 is carried out inverse Fourier transform and is rebuild.
Resulting graphical representation is handled by video processor 48, and is shown on the user interface 50 that is equipped with human-readable display.Interface 50 is personal computer or workstation preferably.Except generating video image, graphical representation also can be handled and print, transmit via computer network or the Internet by printer driver, or the like.Preferably, user interface 50 also allows radiation physics teacher or other operators and resonance controller 40 to communicate, with selection magnetic resonance imaging sequence, modification imaging sequence, execution imaging sequence, or the like.
With reference to Fig. 2, illustrate the end portion of the birdcage coil 10 that has amplified, described end portion comprises many crosspieces 12, described crosspiece 12 extends parallel to each other, and be coupled to the outward flange 15 of end ring 16 by connector part 14 in each end.For reduced graph 2-10, it is smooth in the plane that described crosspiece and ring segment are described to, rather than the cylindrical arrangement of the reality that adopts with their.In addition, about the shape of connector part 14 (for example, rectangle, trapezoidal, parallelogram, or the like), should be understood that, the planar graph that such description is applied to simplify herein, and be coupled to the parallel edge of the connector part of crosspiece and end ring, can be bent to be suitable for cylindrical end ring.In one embodiment, crosspiece comprises the metallic region that is deposited on the cylindrical bearing structure, and in this case, connector part has and the corresponding curved edge of the curvature of end ring and crosspiece.Perhaps, in the embodiment that adopts the polygon end ring, this type of edge may be straight.
Although do not illustrate, should be understood that similarly the end ring assembly will be set at other ends of crosspiece 12.The structure of birdcage coil 10 has increased B
1Intensity, improved axial homogeneity, and changed available volume can not be axially away from restriction.In one embodiment, ring segment has the circumferential length that equals the crosspiece width substantially.Connector part 14 is basic vertical with the end ring both with its crosspiece, but can adopt the supplementary angle combination except approximate 90 ° that crosspiece is coupled to end ring.For example, each crosspiece can extend through the outside or the remote edge of end ring a little, so that form approximate X ° angle between crosspiece and the connector part, the while connector part is connected to end ring with approximate Y ° angle, and wherein X+Y equals 180 °.Perhaps, the length of crosspiece has distance between the outer ledge that is shorter than two end ring, thereby makes X less than Y and X+Y=180 °.In other embodiments, connector part is crooked on one or more.
Illustrated in the cylindrical birdcage of part 10 representative of explanation one section, comprise two cylindrical end ring of spaced apart preset distance, the cylindrical end ring of wherein each comprises the ring segment 18 of predetermined quantity.In an example, for example in the low pass birdcage is arranged, end ring 16 is continuous (for example, only having a continuous ring segment 18) and do not have capacitor, and each crosspiece comprises one or more capacitor (not shown) simultaneously.In another example, for example in high pass birdcage was arranged, each end ring had N ring segment 18 with N group capacitor 20 arranged alternate, and wherein N is an integer, and N crosspiece do not comprise any capacitor.In another example, for example in the logical birdcage device of band, crosspiece and end ring both comprise capacitor.Under any circumstance, crosspiece extend and be connected to end ring (with respect to etc. the center) the axial location of remote edge.
Fig. 3 illustrates another embodiment of birdcage coil 10, wherein, crosspiece 12 is narrower (for example than ring segment 18, on the circumferencial direction of the longitudinal axis of birdcage), and each connector part 14 has isosceles-trapezium-shaped, and have the crosspiece lateral edges that length is approximately equal to the circumferential length of crosspiece, and have the ring lateral edges that length is approximately equal to the width of the ring segment 18 that is attached with connector part.Like this, the crosspiece width is not limited to equal the circumferential length of ring segment.
Fig. 4 illustrates the part of birdcage coil 10, and wherein, crosspiece 12 is with respect to ring segment 18 skew, make crosspiece be placed into substantially between the longitudinal axis of capacitor and birdcage coil ring-plate capacitor above.In this embodiment, each connector part 14 is constructed to parallelogram, makes that the edge of connector part of remote edge 15 of the section 18 be connected to crosspiece and end ring 16 is equal substantially on length, and opposed edges also is like this.The height of described parallelogram can make crosspiece leave the desired or predetermined distance of end ring (for example, crosspiece radially inwardly is placed into the distance of end ring).Randomly, ring segment can wideer than crosspiece (for example, at circumferencial direction).
Fig. 5 is the illustrating of part of birdcage coil 10, and wherein, each connector part 14 has irregular trapezoidal shape, and has parallel crosspiece lateral edges and ring lateral edges, but has the incongruent opposite edges of crossing over distance between crosspiece and end ring.In this embodiment, ring segment is than crosspiece wide (for example, at circumferencial direction).As use connector part arbitrarily described herein, the mode that the shape of each connector part is designed to help with electric loss and/or impedance minimum is connected to ring segment with crosspiece, reduces the interference to generation magnetic field simultaneously.
Fig. 6-8 illustrates and crosspiece 12, the shape of connector part 14 when being coupled to end ring section 18 and/or the additional embodiments of orientation.Fig. 6 illustrates the part of birdcage coil 10, and wherein, the trapezoidal shape of connector part 14 helps placing crosspiece 12 with covering ring-plate capacitor 20, and the part that is attached with the crosspiece section 18 of connector part.Described connector part has the crosspiece lateral edges of length corresponding to the crosspiece width, and the shorter parallel ring lateral edges of remote edge adjacent capacitor 20, that be coupled to ring segment.Other edges of connector part have the Len req that reaches predetermined altitude or distance between crosspiece and ring segment and/or capacitor, and they are congruences.Fig. 6 and Fig. 7 and 8 are different from Fig. 2-5 and are, connector part 14 is attached to ring segment by a fraction of ring segment width.
Fig. 7 illustrates the part of birdcage coil 10, and wherein, connector part 14 has irregular trapezoidal shape, and it is placed into crosspiece 12 top of capacitor 20 substantially.In one embodiment, described connector part has the crosspiece lateral edges that length equals the crosspiece width substantially, and the shorter parallel annular lateral edges of remote edge adjacent capacitor 20, that be coupled to ring segment.In this embodiment, described ring segment is than crosspiece wide (for example, at circumferencial direction).Other edges of connector have the Len req that reaches predetermined altitude between crosspiece and ring segment and/or capacitor, and they are incongruent.For example, the capacitor lateral edges of connector part is longer than ring segment lateral edges, and this makes crosspiece be positioned at the top of capacitor substantially.
Fig. 8 illustrates the part of birdcage coil 10, and wherein, connector part 14 has parallelogram shape, and it is placed into crosspiece 12 top of capacitor 20 substantially.In one embodiment, described connector part has the crosspiece lateral edges that length equals the crosspiece width substantially, and the isometric substantially parallel annular lateral edges of remote edge adjacent capacitor 20, that be coupled to ring segment.In this embodiment, ring segment is than crosspiece wide (for example, at circumferencial direction).Other edges of connector part have the Len req that reaches the preset distance between crosspiece and ring segment and/or capacitor.Fig. 8 also illustrates and uses the selection be longer than at the crosspiece 12 of the axially spaced-apart of the outer ledge 15 of end ring 16.
The structure permission crosspiece of Fig. 4-8 is used to shield the high-tension electric field from across the end ring capacitor.This has reduced the SAR of patient body near each section of connector part and end ring conversely.
Fig. 9 illustrates the part of birdcage coil 10, wherein, two capacitors 22 that the end ring capacitor at the distal part edge is connected in series and 24 substitute, and connector part 14 is connected to their inter-engagement place.Keep and be placed on capacitor residual between the ring segment 18 20 (for example, the capacitor of Zhong Jian capacitor and the most close end ring inward flange). Capacitor 22 and 24 can have the basic value that equates, and can select to have and double values before the capacitor 20 substantially, makes capacitor 22 and 24 be approximately equal to the electric capacity of respective electrical container 20 across the total capacitance of capacitor 22 and 24 when connecting.The birdcage structure of Fig. 8 has reduced the needs that the inclination between the distal metal edge of connector part and end ring section is connected.(being connected of) center " joint (tap) " for example, as formed with 24 by capacitor 22, what allow symmetry radially connects and divides equally maximum voltage between any connector part and two the adjacent annular sections with the ring capacitor that separates.
Figure 10 illustrates the part of birdcage coil 10, wherein, a part or all ring-plate capacitor are had 22,24 pairs in the capacitor of suitable increase to substitute by its value, and the inter-engagement place is connected with the bonding jumper 26 of the remote edge that is stretched over ring segment 18 and is connected with connector part 14.Therefore the cagelike structure of Fig. 9 has also reduced the needs that the inclination between the distal metal edge of connector part and end ring section is connected.Similarly, connect, and divide maximum voltage between connector part arbitrarily and two adjacent annular sections equally with allowing symmetrical ray being connected of the center " joint " of the ring capacitor that separates (for example, formed with 24) by capacitor 22.
Should be understood that, crosspiece 12, connector part 14, ring segment 18 and/or bonding jumper 26 can be by single piece of material (for example, paper tinsel on metal, the dielectric base, or the like) form, and their according to arbitrarily as the desired former figures of deviser and/or according to predetermined design constraint is configured to desired configuration, or pass through the electronics jointing.Then, engage a plurality of crosspieces by ring-plate capacitor being adhered to corresponding annular section part to produce required birdcage configuration with complete annular section.
The present invention has been described with reference to some embodiment.Other people are reading and are understanding under the situation of instructions and can expect various modifications and changes.The present invention is intended to be understood that to comprise these type of all modifications and changes as long as they fall into the scope of claims and content of equal value thereof.
Claims (15)
1. birdcage coil (10) that is used for the magnetic resonance imaging device comprising:
Around two end ring (16) that central shaft is placed, each end ring (16) has inward flange and remote edge (15);
A plurality of crosspieces (12), the length of described crosspiece is greater than the axial distance that is parallel to described extension of central axis between the described inward flange of described end ring (16), and described crosspiece ends at the point near the described remote edge (15) of each end ring (16), and described crosspiece (12) limits the right cylinder of diameter less than the diameter of described end ring (16); And
Be positioned at each terminal connector part (14) of each crosspiece (12), it is coupled to each corresponding crosspiece (12) remote edge (15) of each corresponding end ring (16).
2. birdcage coil as claimed in claim 1, wherein, each end ring (16) also comprises a plurality of ring segments (18), and a plurality of capacitors (20) that connect every pair of adjacent annular section (18).
3. birdcage coil as claimed in claim 2, wherein, described crosspiece (12) be placed on described capacitor (20) and described coil (10) etc. between the center.
4. birdcage coil as claimed in claim 2, wherein, described connector part (14) has the described crosspiece (12) that is coupled to it and the corresponding curved edge of curvature of described ring segment (18), and described connector part (14) with respect to described coil (10) etc. the center described crosspiece (12) is connected to described ring segment (18) as the crow flies and symmetrically.
5. birdcage coil as claimed in claim 3, wherein, described connector part (14) is parallelogram basically, and have the described crosspiece (12) that is coupled to it and the corresponding curved edge of curvature of described ring segment (18), between described capacitor (20) and described central shaft, radially place described crosspiece (12).
6. birdcage coil as claimed in claim 3, wherein, described connector part (14) is parallelogram basically, and have the described crosspiece (12) that is coupled to it and the corresponding curved edge of curvature of described ring segment (18), it is placed to the predetermined height of described a plurality of capacitor (20) top.
7. birdcage coil as claimed in claim 3, wherein, described connector part (14) is constructed to isosceles trapezoid substantially, and has the described crosspiece (12) that is coupled to it and the corresponding curved edge of curvature of described ring segment (18).
8. birdcage coil as claimed in claim 3, wherein, described connector part (14) is constructed to irregular trapezoidal substantially, and has the described crosspiece (12) that is coupled to it and the corresponding curved edge of curvature of described ring segment (18).
9. birdcage coil as claimed in claim 2, wherein, described end ring (16) also comprise and any two adjacent annular sections (18) between the described remote edge (15) of described end ring (16) capacitor connected in series (22,24) that is adjacent to place right.
10. birdcage coil as claimed in claim 9, wherein, described connector part (14) described capacitor (22,24) between be coupled on the described end ring (16).
11. birdcage coil as claimed in claim 10, wherein, each crosspiece (12) is by at least one pair of capacitor (20; 22,24) it is right to be connected to ring segment (18).
12. a magnetic resonance imaging system comprises:
Main magnet assembly (4);
A plurality of gradient coils (8); And
Birdcage coil as claimed in claim 1 (10).
13. birdcage coil as claimed in claim 2, wherein, described connector part (14) is coupled on the bonding jumper (26) at the some place of the described remote edge (15) of close described ring.
14. birdcage coil as claimed in claim 2, wherein, described bonding jumper (26) be coupled to a plurality of capacitor connected in series (22,24) centering each between intermediate head on.
15. birdcage coil as claimed in claim 14, wherein, described connector part (14) is a trapezoidal shape, and the corresponding curved edge of curvature with the described crosspiece (12) that is coupled to it, and have the ring lateral edges that length is approximately equal to described bonding jumper (26) width, and the crosspiece lateral edges that is approximately equal to described crosspiece (12) width.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07118668.8 | 2007-10-17 | ||
| EP07118668 | 2007-10-17 | ||
| PCT/IB2008/054228 WO2009050650A2 (en) | 2007-10-17 | 2008-10-15 | Birdcage coil with improved homogeneity and reduced sar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101828125A true CN101828125A (en) | 2010-09-08 |
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ID=40567872
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200880111834A Pending CN101828125A (en) | 2007-10-17 | 2008-10-15 | Birdcage coil with improved homogeneity and reduced SAR |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20100219834A1 (en) |
| EP (1) | EP2203757A2 (en) |
| JP (1) | JP2011500193A (en) |
| CN (1) | CN101828125A (en) |
| WO (1) | WO2009050650A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103764023A (en) * | 2011-07-30 | 2014-04-30 | 株式会社日立医疗器械 | Birdcage-type high-frequency coil and magnetic resonance imaging device |
| CN107076812A (en) * | 2014-10-16 | 2017-08-18 | 皇家飞利浦有限公司 | MRI birdcage coils with distribution excitation |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007016312B4 (en) * | 2007-04-04 | 2010-06-17 | Siemens Ag | Birdcage-like transmitting antenna for magnetic resonance applications with differently shaped termination elements |
| US9429634B2 (en) * | 2008-04-07 | 2016-08-30 | University Of Queensland | MRI coil design with volumetric trough-shaped coil elements |
| WO2014053289A1 (en) | 2012-10-02 | 2014-04-10 | Koninklijke Philips N.V. | Birdcage body coil for parallel transmit mri |
| US9720059B2 (en) * | 2013-04-03 | 2017-08-01 | National Taiwan University | Multi-channel coil array for parallel magnetic resonance imaging |
| US10632327B2 (en) * | 2014-11-04 | 2020-04-28 | Synaptive Medical (Barbados) Inc. | MRI guided radiation therapy |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030193380A1 (en) * | 2002-04-12 | 2003-10-16 | De Swiet Thomas | Nmr resonators optimized for high q factor |
| CN1590994A (en) * | 2003-06-11 | 2005-03-09 | 斯滨洛克有限责任公司 | Method for detecting,analyzing and displaying nuclear quadrupole resonance and nuclear magnetic resonance compound at the same time |
| US20050107684A1 (en) * | 2003-11-18 | 2005-05-19 | Ge Medical Systems Global Technology Company, Llc | Elevated Endring Birdcage Antenna For MRI Applications |
| CN1717591A (en) * | 2002-11-27 | 2006-01-04 | 皇家飞利浦电子股份有限公司 | Degenerate birdcage coil and transmit/receive apparatus and method for same |
Family Cites Families (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4845431A (en) * | 1988-03-18 | 1989-07-04 | University Of Pittsburgh | Variable aperture, variable frequency extremity coil for magnetic resonance imaging |
| GB2235781B (en) * | 1989-08-11 | 1994-05-04 | Nat Res Dev | Resonant cavities for NMR |
| DE4408195C2 (en) * | 1994-03-11 | 1996-09-05 | Bruker Analytische Messtechnik | Magnetic resonance resonator |
| JP3382865B2 (en) * | 1998-12-10 | 2003-03-04 | ジーイー横河メディカルシステム株式会社 | RF magnetic field forming apparatus and magnetic resonance imaging apparatus |
| US6285189B1 (en) * | 1999-09-04 | 2001-09-04 | Varian, Inc. | Millipede coils |
| US6396271B1 (en) * | 1999-09-17 | 2002-05-28 | Philips Medical Systems (Cleveland), Inc. | Tunable birdcage transmitter coil |
| US6316941B1 (en) * | 2000-02-24 | 2001-11-13 | Marconi Medical Systems, Inc. | Open view quadrature birdcage coil |
| US6377047B1 (en) * | 2000-06-08 | 2002-04-23 | Varian, Inc. | Superconducting birdcage coils |
| US6611702B2 (en) * | 2001-05-21 | 2003-08-26 | General Electric Company | Apparatus for use in neonatal magnetic resonance imaging |
| US6404201B1 (en) * | 2001-07-02 | 2002-06-11 | Ge Medical Systems Global Technology Company, Llc | Magnetic resonance imaging RF coil |
| US6781378B2 (en) * | 2002-02-19 | 2004-08-24 | Siemens Aktiengesellschaft | Radio-frequency antenna for a magnetic resonance system |
| DE10306998B3 (en) * | 2003-02-19 | 2005-04-21 | Siemens Ag | Radio-frequency antenna for a magnetic resonance system |
| WO2006042267A1 (en) * | 2004-10-07 | 2006-04-20 | Invivo Corporation | Method and apparatus for discrete shielding of volume rf coil arrays |
| US7292038B2 (en) * | 2005-05-02 | 2007-11-06 | Doty Scientific, Inc. | Double-balanced double-tuned CP birdcage with similar field profiles |
| US8035384B2 (en) * | 2008-10-23 | 2011-10-11 | General Electric Company | Hybrid birdcage-TEM radio frequency (RF) coil for multinuclear MRI/MRS |
-
2008
- 2008-10-15 JP JP2010529482A patent/JP2011500193A/en not_active Withdrawn
- 2008-10-15 WO PCT/IB2008/054228 patent/WO2009050650A2/en active Application Filing
- 2008-10-15 CN CN200880111834A patent/CN101828125A/en active Pending
- 2008-10-15 US US12/738,303 patent/US20100219834A1/en not_active Abandoned
- 2008-10-15 EP EP08839833A patent/EP2203757A2/en not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20030193380A1 (en) * | 2002-04-12 | 2003-10-16 | De Swiet Thomas | Nmr resonators optimized for high q factor |
| US6667674B2 (en) * | 2002-04-12 | 2003-12-23 | Varian, Inc. | NMR resonators optimized for high Q factor |
| CN1717591A (en) * | 2002-11-27 | 2006-01-04 | 皇家飞利浦电子股份有限公司 | Degenerate birdcage coil and transmit/receive apparatus and method for same |
| CN1590994A (en) * | 2003-06-11 | 2005-03-09 | 斯滨洛克有限责任公司 | Method for detecting,analyzing and displaying nuclear quadrupole resonance and nuclear magnetic resonance compound at the same time |
| US20050107684A1 (en) * | 2003-11-18 | 2005-05-19 | Ge Medical Systems Global Technology Company, Llc | Elevated Endring Birdcage Antenna For MRI Applications |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103764023A (en) * | 2011-07-30 | 2014-04-30 | 株式会社日立医疗器械 | Birdcage-type high-frequency coil and magnetic resonance imaging device |
| CN103764023B (en) * | 2011-07-30 | 2016-03-16 | 株式会社日立医疗器械 | Birdcage high frequency coil and MR imaging apparatus |
| CN107076812A (en) * | 2014-10-16 | 2017-08-18 | 皇家飞利浦有限公司 | MRI birdcage coils with distribution excitation |
| CN107076812B (en) * | 2014-10-16 | 2019-11-01 | 皇家飞利浦有限公司 | MRI birdcage coil with distribution excitation |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2203757A2 (en) | 2010-07-07 |
| WO2009050650A2 (en) | 2009-04-23 |
| JP2011500193A (en) | 2011-01-06 |
| WO2009050650A3 (en) | 2009-07-02 |
| US20100219834A1 (en) | 2010-09-02 |
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Application publication date: 20100908 |